Keep in mind that a lot of it is your perception. It isn't like you are getting one tank continually withdrawing on you; 10 tanks can withdraw from the queue, but from your perspective you just got dumped 10 times in a row even though each of them individually only did it once. Not sure how you would police something like that without doing harm to all the people who aren't abusing the system. They could put in a "no more than 3 withdraws within x seconds" rule, but your husband could still see 20 tank withdraws in a row from 20 different tanks. So....